Method, apparatus and system for controlling routing information advertising

ABSTRACT

The application disclose a method, an apparatus and a system for controlling routing information advertising, which relates to the field of communications and is used for reducing the configuration complexity and reinforcing the operability. The method includes: receiving, by a control device, first routing information sent by a first forwarding device; wherein the first routing information includes an identifier of the first forwarding device; determining a first routing path according to the identifier of the first forwarding device, an identifier of a second forwarding device and a routing path group; and determining an advertising range of second routing information for the second forwarding device according to the first routing path; for enabling the second forwarding device to advertise the second routing information according to the advertising range of the second routing information.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Patent Application No. PCT/CN2014/077110, filed on May 9, 2014, which claims priority to Chinese Patent Application No. 201310180233.X, filed on May 15, 2013, both of which are hereby incorporated by reference in their entireties.

TECHNICAL FIELD

The present application relates to the field of communications, and particularly, to a method, an apparatus and a system for controlling routing information advertising.

BACKGROUND

An autonomous system (Autonomous System, referred to as AS) includes multiple routers (clients) and a reflection router, a router located at the periphery (edge) of the AS may be called an edge router, and the edge router in one AS may exchange routing information with edge routers in other ASs. The relationship between two edge routers which may exchange the routing information and respectively belongs to different ASs may be called an external neighbor relationship.

With the rapid development of network technology and the continuous growth of user needs, cases of mutual access between different ASs are more and more popular. With the service growth, a flow outlet of one AS accessing another AS needs to be dynamically adjusted. With AS1 accessing AS2 as an example, in general, a multi-exist-discriminator (Multi-exit-discriminator, referred to as MED) advertised by the AS2 to the AS1 is dynamically adjusted to enable an edge router of the AS1 to dynamically adjust a routing result, so as to adjust the flow outlet.

Specifically, an interior gateway protocol path weight (IGP Metric) between the routers in the AS2 is set in a reflection router according to an expected flow model, and the IGP is an abbreviation of an interior gateway protocol path weight (Interior Gateway Protocol); when advertising the routing information to other routers in the AS2, the reflection router carries the path weight; an edge router in the AS2 advertises the routing information to the edge router in the AS1 having an external neighbor relationship with the edge router in the AS2; when a certain edge router in the AS1 has an external neighbor relationship with at least two edge routers in the AS2, the edge router uses the path weight as MED and determines the routing result according to the MED, so as to adjust the flow outlet according to the expected flow model.

In the solution of dynamically adjusting the MED advertised by the AS2 to the AS1 to adjust the flow outlet, multiple routers need to cooperatively configure the path weight, so that the configuration is complicated and the user operability is poor.

SUMMARY

Embodiments of the present application provide a method, an apparatus and a system for controlling routing information advertising, which is used for reducing the configuration complexity and reinforcing the operability.

To fulfill the above-mentioned objectives, the embodiments of the present application adopt the following technical solutions:

In a first aspect, a method for controlling routing information advertising is provided, comprising:

-   -   receiving, by a control device, first routing information sent         by a first forwarding device, wherein the first routing         information comprises an identifier of the first forwarding         device;     -   determining a first routing path according to the identifier of         the first forwarding device, an identifier of a second         forwarding device and a routing path group; and     -   determining an advertising range of second routing information         for the second forwarding device according to the first routing         path; wherein the second routing information is routing         information generated by the control device according to the         first routing information, the second forwarding device is a         receiver of the second routing information advertised by the         control device, and the advertising range of the second routing         information comprises an identifier of an external neighbor of         the second forwarding device, for enabling the second forwarding         device to advertise the second routing information according to         the advertising range of the second routing information.

In combination with the first aspect, in a first possible implementation manner, the determining an advertising range of second routing information for the second forwarding device according to the first routing path, comprises:

-   -   taking the identifier of the external neighbor of the second         forwarding device comprised in the first routing path as the         advertising range of the second routing information for the         second forwarding device.

In combination with the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner, determining a first routing path according to the identifier of the first forwarding device, an identifier of a second forwarding device and a routing path group, comprises:

-   -   selecting a routing path comprising the identifier of the first         forwarding device and the identifier of the second forwarding         device from the routing path group to serve as the first routing         path.

In combination with the first aspect, in a third possible implementation manner, before the determining a first routing path according to the identifier of the first forwarding device, an identifier of a second forwarding device and a routing path group, the method further comprises:

-   -   obtaining an internal network topology and an external network         topology for the second forwarding device within a preset range;     -   generating the internal network topology and the external         network topology for the second forwarding device into a whole         network topology for the second forwarding device;     -   determining the routing path group according to the whole         network topology for the second forwarding device.

In combination with the third possible implementation manner of the first aspect, in a fourth possible implementation manner, the obtaining an external network topology for the second forwarding device within a preset range, comprises:

-   -   obtaining the external network topology for the second         forwarding device stored by itself;     -   or, receiving the external network topology for the second         forwarding device sent by the second forwarding device.

In combination with the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, the obtaining the external network topology for the second forwarding device stored by itself, comprises:

-   -   obtaining the external network topology for the second         forwarding device stored by itself through a graphic user         interface GUI or a command line.

In a second aspect, a method for controlling routing information advertising is provided, comprising:

-   -   receiving, by a second forwarding device, second routing         information sent by a control device; wherein the second routing         information comprises an advertising range of the second routing         information, and the advertising range of the second routing         information comprises an identifier of an external neighbor of         the second forwarding device; and     -   controlling the advertising of the second routing information         according to the advertising range of the second routing         information.

In combination with the second aspect, in a first possible implementation manner, the controlling the advertising of the second routing information according to the advertising range of the second routing information, comprises:

-   -   advertising the second routing information to the external         neighbor of the second forwarding device corresponding to the         advertising range of the second routing information.

In combination with the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner, before the receiving, by a second forwarding device, second routing information sent by a control device, the method further comprises:

-   -   sending a network topology for the second forwarding device to         the control device, for enabling the control device to generate         the second routing information at least according to first         routing information sent by a first forwarding device and the         network topology for the second forwarding device.

In a third aspect, an apparatus for controlling routing information advertising is provided, comprising:

-   -   a receiving unit, configured to receive first routing         information sent by a first forwarding device, wherein the first         routing information comprises an identifier of the first         forwarding device;     -   a routing path determining unit, configured to determine a first         routing path according to the identifier of the first forwarding         device transmitted by the receiving unit, an identifier of a         second forwarding device and a routing path group; and     -   an advertising range determining unit, configured to determine         an advertising range of second routing information for the         second forwarding device according to the first routing path         transmitted by the routing path determining unit; wherein the         second routing information is routing information generated by         the apparatus according to the first routing information, the         second forwarding device is a receiver of the second routing         information advertised by the apparatus, and the advertising         range of the second routing information comprises an identifier         of an external neighbor of the second forwarding device; for         enabling the second forwarding device to advertise the second         routing information according to the advertising range of the         second routing information.

In combination with the third aspect, in a first possible implementation manner, the advertising range determining unit is specifically configured to take the identifier of the external neighbor of the second forwarding device comprised in the first routing path as the advertising range of second routing information for the second forwarding device.

In combination with the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner, the routing path determining unit is specifically configured to select a routing path comprising the identifier of the first forwarding device and the identifier of the second forwarding device from the routing path group to serve as the first routing path.

In combination with the third aspect, in a third possible implementation manner, the apparatus further comprising:

-   -   a network topology obtaining unit, configured to obtain an         internal network topology and an external network topology for         the second forwarding device within a preset range; and generate         the internal network topology and the external network topology         for the second forwarding device into a whole network topology         for the second forwarding device;     -   a routing path group determining unit, configured to determine         the routing path group according to the whole network topology         for the second forwarding device.

In combination with the third possible implementation manner of the third aspect, in a fourth possible implementation manner, the network topology obtaining unit is specifically configured to,

-   -   obtain the external network topology for the second forwarding         device stored by itself;     -   or, receive the external network topology for the second         forwarding device sent by the second forwarding device.

In combination with the fourth possible implementation manner of the third aspect, in a fifth possible implementation manner, the network topology obtaining unit is specifically configured to obtain the external network topology for the apparatus stored by itself through a graphic user interface GUI or a command line.

In a fourth aspect, an apparatus for controlling routing information advertising is provided, comprising:

-   -   a receiving unit, configured to receive second routing         information sent by a control device; wherein the second routing         information comprises an advertising range of the second routing         information; and the advertising range of the second routing         information comprises an identifier of an external neighbor of         the apparatus; and     -   a controlling unit, configured to control the advertising of the         second routing information according to the advertising range of         the second routing information transmitted by the receiving         unit.

In combination with the fourth aspect, in a first possible implementation manner, the controlling unit is specifically configured to advertise the second routing information to the external neighbor of the apparatus corresponding to the advertising range of the second routing information.

In combination with the fourth aspect or the first possible implementation manner of the fourth aspect, in a second possible implementation manner, the apparatus further comprising:

-   -   a sending unit, configured to send a network topology for the         apparatus to the control device, for enabling the control device         to generate the second routing information at least according to         first routing information sent by a first forwarding device and         the network topology for the apparatus.

In a fifth aspect, a system for controlling routing information advertising is provided, including the apparatus for advertising routing information as shown in the above-mentioned third aspect and/or the apparatus for advertising routing information as shown in the above-mentioned fourth aspect.

According to the method, the apparatus and the system for controlling routing information advertising provided by embodiments of the present application, a control device determines a first routing path through an identifier of a first forwarding device (an identifier of a sender of the routing information) and an identifier of a second forwarding device (an identifier of a receiver of the routing information), and determines an advertising range of the routing information for the second forwarding device according to the first routing path, and the second forwarding device advertises the routing information according to the advertising range of the routing information, such that advertising the routing information by the second forwarding device is centrally controlled at the control device side, the configuration complexity is reduced and the operability is reinforced. The problems of complicated configuration and poor user operability caused by the fact that multiple routers are required to cooperatively configure the path weight in the prior art are solved.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic diagram of a flow of a method for controlling routing advertising provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of a flow of another method for controlling routing advertising provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of a flow of another method for controlling routing advertising provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of an AS architecture provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of a structure of an apparatus for controlling routing advertising provided by an embodiment of the present application;

FIG. 6 is a schematic diagram of a structure of another apparatus for controlling routing advertising provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of a structure of another apparatus for controlling routing advertising provided by an embodiment of the present application;

FIG. 8 is a schematic diagram of a structure of another apparatus for controlling routing advertising provided by an embodiment of the present application;

FIG. 9 is a schematic diagram of a structure of another apparatus for controlling routing advertising provided by an embodiment of the present application;

FIG. 10 is a schematic diagram of a structure of another apparatus for controlling routing advertising provided by an embodiment of the present application;

FIG. 11 is a schematic diagram of a structure of another apparatus for controlling routing advertising provided by an embodiment of the present application.

DESCRIPTION OF EMBODIMENTS

An exemplary description of a method, an apparatus and a system for controlling routing advertising provided by embodiments of the present application will be given below in combination with the accompanying drawings.

Referring to FIG. 1, it is a method for controlling routing advertising provided by an embodiment of the present application, including:

101: A control device receives first routing information sent by a first forwarding device; wherein the first routing information includes an identifier of the first forwarding device;

exemplarily, the method for controlling routing advertising provided by the embodiment of the present application may be applied to an AS, and in the AS, routing information may be exchanged via a border gateway protocol (Border Gateway Protocol, referred to as BGP). One AS may include one or multiple reflection routers and a plurality of routers (clients), the reflection router and the router in the AS may exchange the routing information via an internal BGP (Internal BGP, referred to as IBGP), and the connection relationship thereof is called IBGP connection; the router located at the periphery (edge) of the AS may be called an edge router, the edge routers respectively belonging to different ASs may exchange the routing information via an external BGP (External BGP, referred to as EBGP), and the connection relationship thereof is called EBGP connection.

The control device may be a reflection router in the AS, and may also be another device with the function of the reflection router; the first forwarding device may be an edge router in the AS to which the control device belongs;

102: A first routing path is determined according to the identifier of the first forwarding device, an identifier of a second forwarding device and a routing path group;

exemplarily, since the flow direction is opposite to the routing direction, a path in an opposite direction of a flow path may be called a routing path. The routing path group may include multiple routing paths, the routing path is composed of identifiers of multiple nodes within a preset range, and the preset range may be preset in the control device.

Optionally, step 102 may include: selecting a routing path containing the identifier of the first forwarding device and the identifier of the second forwarding device from the routing path group to serve as the first routing path.

Exemplarily, the routing path between two arbitrary nodes is obtained according to a network topology and a preset rule, wherein the preset rule includes: the identifier of any other node excluding end nodes only belongs to one routing path, or the like, where the end nodes refer to nodes at both ends of one routing path.

According to the above-mentioned preset rule, one routing path may be matched in the routing path group by determining the identifiers of two nodes, namely, one routing path may be matched by selecting the identifier of the first forwarding device and the identifier of the second forwarding device, and the routing path is taken as the first routing path.

Further optionally, the determining the routing path group according to a network topology within a preset range may further include: determining the routing path group according to the network topology within the preset range and a constraint condition, wherein the constraint condition includes path length constraint or bandwidth constraint.

Exemplarily, in the network topology, multiple routing paths may exist between any two nodes, so that when determining the routing path between two nodes according to the network topology, some constraint conditions may be added to obtain a routing path expected by the user. Optionally, the constraint conditions may include path length constraint or bandwidth constraint, etc. For example, the routing path with the shortest path between the two nodes may be obtained in the network topology according to the path length constraint, or the routing path with the highest bandwidth between the two nodes is obtained in the network topology according to the bandwidth constraint.

Multiple routing paths obtained in the network topology within the preset range according to the constraint condition form the routing path group. In this case, the first routing path matched in the routing path group is the routing path between two certain nodes expected by the user.

Further, prior to step 102, the method may further include:

-   -   1) obtaining an internal network topology and an external         network topology for the second forwarding device within a         preset range;     -   2) generating the internal network topology and the external         network topology for the second forwarding device into a whole         network topology for the second forwarding device; and     -   3) determining the routing path group according to the whole         network topology for the second forwarding device.

Exemplarily, the external network topology for the second forwarding device refers to the network topology formed by the second forwarding device and an external neighbor of the second forwarding device, where the external neighbor of the second forwarding device is the device having an external neighbor relationship with the second forwarding device.

In an embodiment of the present application, the method for obtaining the internal network topology and the external network topology for the second forwarding device within the preset range is not limited, for example, the internal network topology may be gathered via an interior gateway protocol (Interior Gateway Protocol, referred to as IGP), and the external network topology for the second forwarding device may be collectively generated by user configuration and BGP routing, etc.

Optionally, the external network topology for the second forwarding device stored by itself is obtained; specifically, the external network topology for the second forwarding device stored by itself is obtained in such manners as a graphic user interface (Graphical User Interface, referred to as GUI) or a command line, etc.

Optionally, the external network topology for the second forwarding device sent by the second forwarding device is received.

103: An advertising range of the second routing information for the second forwarding device is determined according to the first routing path; wherein the second routing information is routing information generated by the control device according to the first routing information, the second forwarding device is a receiver of the second routing information advertised by the control device, and the advertising range of the second routing information includes an identifier of the external neighbor of the second forwarding device, for enabling the second forwarding device to advertise the second routing information according to the advertising range of the second routing information.

Exemplarily, after receiving the first routing information sent by the first forwarding device, the control device generates the first routing information into the second routing information and advertises the second routing information to other forwarding device in the AS to which the control device belongs. The second forwarding device may be an edge forwarding device (an edge router) excluding the first forwarding device in the AS to which the control device belongs.

The generating the first routing information into the second routing information may include changing the next hop and the like, and in an embodiment of the present application, the second routing information may further carry the advertising range of the second routing information for the second forwarding device. Wherein, the advertising range of the second routing information for the second forwarding device is used for indicating the second forwarding device to advertise the second routing information to an external neighbor corresponding to the advertising range.

Optionally, step 103 may include: taking the identifier of the external neighbor of the second forwarding device contained in the first routing path as the advertising range of the second routing information for the second forwarding device.

Exemplarily, the second forwarding device may have more than one external neighbor, and the identifier of the external neighbor in the advertising range of the second routing information for the second forwarding device is the identifier of the external neighbor of the second forwarding device contained in the first routing path. Specific reference may be made to the following embodiment.

According to the method for controlling routing information advertising provided by an embodiment of the present application, a control device determines a first routing path through an identifier of a first forwarding device (an identifier of a sender of the routing information) and an identifier of a second forwarding device (an identifier of a receiver of the routing information), and determines the advertising range of the routing information for the second forwarding device according to the first routing path, for enabling the second forwarding device to advertise the routing information according to the advertising range of the routing information, such that advertising the routing information by the second forwarding device is centrally controlled at the control device side, the configuration complexity is reduced and the operability is reinforced. The problems of complicated configuration and poor user operability caused by the fact that multiple routers are required to cooperatively configure the path weight in the prior art are solved.

Referring to FIG. 2, it is a method for controlling routing information advertising provided by an embodiment of the present application, including:

201: A second forwarding device receives second routing information sent by a control device, wherein the second routing information includes an advertising range of the second routing information, and the advertising range of the second routing information includes an identifier of an external neighbor of the second forwarding device;

Further, prior to step 201, the method may further include:

-   -   sending a network topology for the second forwarding device to         the control device, for enabling the control device to generate         the second routing information at least according to first         routing information sent by a first forwarding device and the         network topology for the second forwarding device.

Exemplarily, the control device generates the second routing information according to the network topology for the second forwarding device and the first routing information, specifically, the control device receives the first routing information sent by the first forwarding device, changes a next hop in the first routing information and the like, and adds the advertising range to generate the second routing information. Wherein, the first forwarding device may be the same as the first forwarding device in the above-mentioned embodiment. For the method of the control device for determining the advertising range of the second routing information, the above-mentioned embodiment may be referred, and it will not be repeated redundantly herein.

202: The advertising of the second routing information is controlled according to the advertising range of the second routing information.

Further, step 202 may include: advertising the second routing information to an external neighbor of the second forwarding device corresponding to the advertising range of the second routing information.

Exemplarily, identifiers of multiple external neighbors of the second forwarding device may be stored in the second forwarding device, for example, an external neighbor 1, an external neighbor 2 and an external neighbor 3, the second routing information may be advertised by judging whether the identifier of a certain external neighbor is within the advertising range of the second routing information, specifically, when the identifier of a certain external neighbor is contained in the advertising range of the second routing information, the second routing information is advertised to the external neighbor, and on the contrary, the second routing information is not advertised to the external neighbor, in order to control the routing information advertising of the second forwarding device from the control device side.

According to the method for controlling routing information advertising provided by an embodiment of the present application, a forwarding device receives routing information containing an advertising range sent by a control device, and advertises the routing information according to the advertising range, so that advertising the routing information by the forwarding device is centrally controlled at the control device side, the configuration complexity is reduced and the operability is reinforced. The problems of complicated configuration and poor user operability caused by the fact that multiple routers are required to cooperatively configure the path weight in the prior art are solved.

Referring to FIG. 3, it is a method for controlling routing advertising provided by an embodiment of the present application, including:

301: A control device receives first routing information sent by a first forwarding device; wherein the first routing information includes an identifier of the first forwarding device;

exemplarily, an illustration is given in which the control device is a reflection router.

Referring to FIG. 4, a preset range includes: AS0, AS1, AS2, AS3, the identifier of the AS to which the reflection router belongs is the AS0, the AS0 includes the reflection router, a router 1, a router 2, . . . , a router 5, and the router 1, the router 2, . . . , the router 5 are all edge routers; the edge devices of the AS1 are a router A1, a router B1 and a router C1; the edge device of the AS2 is a router A2; the edge device of the AS3 is a router A3.

Assuming that the first forwarding device is a router 4.

302: The control device obtains an internal network topology within the preset range;

exemplarily, the control device may gather the internal network topology via IGP.

Referring to FIG. 4, the internal network topology of the AS0 is 5 nodes and a connection relationship thereof, specifically, are the router 1, the router 2, . . . , the router 5, and for the connection relationship of the five nodes may be referred to dotted line parts in FIG. 4.

303: The control device obtains an external network topology for the second forwarding device within the preset range;

exemplarily, the control device may collectively generate the external network topology via user configuration and BGP routing; or obtain the external network topology for the second forwarding device stored by itself in such manners as a GUI, a command line and the like; or receive the external network topology for the second forwarding device sent by the second forwarding device, etc.

Referring to FIG. 4, assuming that the second forwarding device is the router 1, and the network neighbors of the router 1 within the preset range are the router A1, the router B1 and the router C1, then the external network topology for the second forwarding device is: the router 1, the router A1, the router B1, the router C1 and the connection relationship of the router 1 with the router A1, the router B1 and the router C1.

304: the control device generates the internal network topology and the external network topology for the second forwarding device into a whole network topology for the second forwarding device;

exemplarily, the whole network topology for the second forwarding device is: the router 1, the router 2, . . . , the router 5, and the connection relationship thereof; the router 1, the router A1, the router B1, the router C1 and the connection relationship of the router 1 with the router A1, the router B1 and the router C1.

305: The control device determines a routing path group according to the whole network topology for the second forwarding device and a constraint condition;

exemplarily, the constraint condition may be path length constraint or bandwidth constraint, etc.

Referring to FIG. 4, the determined routing path group includes:

-   -   a routing path 1: router A1-router 1-router 3-router 4-AS2;     -   a routing path 2: router A1-router 2-router 5-AS3.

306: The control device selects a routing path containing an identifier of the first forwarding device and an identifier of the second forwarding device from the routing path group to serve as a first routing path;

exemplarily, the first routing path may be determined as the routing path 1 according to the identifier of the first forwarding device (the router 4) and the identifier of the second forwarding device (the router 1).

307: The control device takes an identifier of an external neighbor of the second forwarding device contained in the first routing path as an advertising range of second routing information for the second forwarding device;

exemplarily, the identifier (A1) of the external neighbor of the second forwarding device contained in the first routing path (the routing path 1) is taken as the advertising range of the second routing information for the second forwarding device.

308: The control device generates the second routing information according to the first routing information and the advertising range of the second routing information for the second forwarding device;

exemplarily, the control device changes a next hop and the like of the first routing information to generate the second routing information, and the second routing information carries the advertising range of the second routing information.

309: The control device sends the second routing information to the second forwarding device;

310: The second forwarding device obtains the identifier of the external neighbor thereof;

exemplarily, the identifier of the external neighbor of the second forwarding device includes: the router A1, the router B1 and the router C1.

311: The second forwarding device judges whether the identifier of one external neighbor is within the advertising range of the second routing information;

exemplarily, the second forwarding device (the router 1) may respectively judge whether the router A1, the router B1 and the router C1 are within the advertising range of the second routing information. The judging result is as follows: the router A1 is within the advertising range of the second routing information; the router B1 and the router C1 are not within the advertising range of the second routing information.

312: If so, the second routing information is advertised to the external neighbor; if not, the second routing information is not advertised to the external neighbor.

Exemplarily, the router 1 advertises the second routing information to the router A1 and does not advertise the second routing information to the router B1 and the router C1.

According to the method for controlling routing information advertising provided by an embodiment of the present application, a control device determines a first routing path through an identifier of a first forwarding device (an identifier of a sender of the routing information) and an identifier of a second forwarding device (an identifier of a receiver of the routing information), and determines an advertising range of the routing information for the second forwarding device according to the first routing path, and the second forwarding device advertises the routing information according to the advertising range of the routing information, such that advertising the routing information by the second forwarding device is centrally controlled at the control device side, the configuration complexity is reduced and the operability is reinforced. The problems of complicated configuration and poor user operability caused by the fact that multiple routers are required to cooperatively configure the path weight in the prior art are solved.

On one hand, referring to FIG. 5, it is an apparatus 50 for controlling routing information advertising provided by an embodiment of the present application, used for implementing the method for controlling routing information advertising as shown in FIG. 1, including:

-   -   a receiving unit 501, configured to receive first routing         information sent by a first forwarding device; wherein the first         routing information includes an identifier of the first         forwarding device;     -   a routing path determining unit 502, configured to determine a         first routing path according to the identifier of the first         forwarding device transmitted by the receiving unit 501, an         identifier of a second forwarding device and a routing path         group; and     -   an advertising range determining unit 503, configured to         determine an advertising range of second routing information for         the second forwarding device according to the first routing path         transmitted by the routing path determining unit 502, wherein         the second routing information is routing information generated         by the apparatus 50 according to the first routing information,         the second forwarding device is a receiver of the second routing         information advertised by the apparatus 50, and the advertising         range of the second routing information includes an identifier         of an external neighbor of the second forwarding device, for         enabling the second forwarding device to advertise the second         routing information according to the advertising range of the         second routing information.

Further, the advertising range determining unit 503 may be specifically configured to take the identifier of the external neighbor of the second forwarding device contained in the first routing path as the advertising range of the second routing information for the second forwarding device.

Further, the routing path determining unit 502 may be specifically configured to select a routing path containing the identifier of the first forwarding device and the identifier of the second forwarding device from the routing path group to serve as the first routing path.

Further, referring to FIG. 6, the apparatus 50 may further include:

-   -   a network topology obtaining unit 504, configured to obtain an         internal network topology and an external network topology for         the second forwarding device within a preset range, and generate         the internal network topology and the external network topology         for the second forwarding device into a whole network topology         for the second forwarding device;     -   a routing path group determining unit 505, configured to         determine the routing path group according to the whole network         topology for the second forwarding device.

Optionally, the network topology obtaining unit 504 may be specifically configured to,

-   -   obtain the external network topology for the second forwarding         device stored by itself;     -   or, receive the external network topology for the second         forwarding device sent by the second forwarding device.

Optionally, the network topology obtaining unit 504 may be specifically configured to obtain the external network topology for the apparatus stored by itself through a graphic user interface GUI or a command line.

Exemplarily, the apparatus 50 may be the control device in the above-mentioned method embodiment.

According to the apparatus for controlling routing information advertising provided by an embodiment of the present application, a first routing path is determined through an identifier of a first forwarding device (an identifier of a sender of the routing information) and an identifier of a second forwarding device (an identifier of a receiver of the routing information), and an advertising range of the routing information for the second forwarding device is determined according to the first routing path, for enabling the second forwarding device to advertise the routing information according to the advertising range of the routing information, so that advertising the routing information by the second forwarding device is centrally controlled at the control device side, the configuration complexity is reduced and the operability is reinforced. The problems of complicated configuration and poor user operability caused by the fact that multiple routers are required to cooperatively configure the path weight in the prior art are solved.

On one hand, referring to FIG. 7, it is an apparatus 50 for controlling routing information advertising provided by an embodiment of the present application, used for implementing the method for controlling routing information advertising as shown in FIG. 1, including: a receiver 701, a memory 702 and a processor 703 connected with the receiver 701 and the memory 702 respectively, wherein,

-   -   the receiver 701 is configured to receive first routing         information sent by a first forwarding device, wherein the first         routing information includes an identifier of the first         forwarding device;     -   the memory 702 is configured to store a group of codes, wherein         the codes are used for controlling the processor 703 to         implement the following actions:     -   determining a first routing path according to the identifier of         the first forwarding device, an identifier of a second         forwarding device and a routing path group; and     -   determining an advertising range of second routing information         for the second forwarding device according to the first routing         path, wherein the second routing information is routing         information generated by the control device according to the         first routing information, the second forwarding device is a         receiver of the second routing information advertised by the         control device, and the advertising range of the second routing         information includes an identifier of an external neighbor of         the second forwarding device, for enabling the second forwarding         device to advertise the second routing information according to         the advertising range of the second routing information.

Further, the processor 703 may be specifically configured to take the identifier of the external neighbor of the second forwarding device contained in the first routing path as the advertising range of the second routing information for the second forwarding device.

Further, the processor 703 may be specifically configured to select a routing path containing the identifier of the first forwarding device and the identifier of the second forwarding device from the routing path group to serve as the first routing path.

Further, the processor 703 may be further configured to obtain an internal network topology and an external network topology for the second forwarding device within a preset range;

-   -   generate the internal network topology and the external network         topology for the second forwarding device into a whole network         topology for the second forwarding device; and     -   determine the routing path group according to the whole network         topology for the second forwarding device.

Optionally, the processor 703 may be specifically configured to obtain the external network topology for the second forwarding device stored by itself;

-   -   or, receive the external network topology for the second         forwarding device sent by the second forwarding device.

Optionally, the processor 703 may be specifically configured to obtain the external network topology for the second forwarding device stored by itself through a graphic user interface GUI or a command line.

Exemplarily, the apparatus 50 may be the control device in the above-mentioned method embodiment.

According to the apparatus for controlling routing information advertising provided by an embodiment of the present application, a first routing path is determined through an identifier of a first forwarding device (an identifier of a sender of the routing information) and an identifier of a second forwarding device (an identifier of a receiver of the routing information), and an advertising range of the routing information for the second forwarding device is determined according to the first routing path, for enabling the second forwarding device to advertise the routing information according to the advertising range of the routing information, so that advertising the routing information by the second forwarding device is centrally controlled at the control device side, the configuration complexity is reduced and the operability is reinforced. The problems of complicated configuration and poor user operability caused by the fact that multiple routers are required to cooperatively configure the path weight in the prior art are solved.

On one hand, referring to FIG. 8, it is an apparatus 80 for controlling routing information advertising provided by an embodiment of the present application, used for implementing the method for controlling routing information advertising as shown in FIG. 2, including:

-   -   a receiving unit 801, configured to receive second routing         information sent by a control device, wherein the second routing         information includes an advertising range of the second routing         information, and the advertising range of the second routing         information includes an identifier of an external neighbor of         the apparatus; and     -   a controlling unit 802, configured to control the advertising of         the second routing information according to the advertising         range of the second routing information transmitted by the         receiving unit 801.

Further, the controlling unit 802 may be specifically configured to advertise the second routing information to the external neighbor of the apparatus corresponding to the advertising range of the second routing information.

Further, referring to FIG. 9, the apparatus 80 may further include:

-   -   a sending unit 803, configured to send a network topology for         the apparatus to the control device, for enabling the control         device to generate the second routing information at least         according to first routing information sent by a first         forwarding device and the network topology for the apparatus.

Exemplarily, the apparatus 80 may be the second forwarding device in the above-mentioned method embodiment.

According to the apparatus for controlling routing information advertising provided by an embodiment of the present application, by receiving routing information containing an advertising range sent by a control device and by advertising the routing information according to the advertising range, so that advertising the routing information by a forwarding device is centrally controlled at the control device side, the configuration complexity is reduced and the operability is reinforced. The problems of complicated configuration and poor user operability caused by the fact that multiple routers are required to cooperatively configure the path weight in the prior art are solved.

On one hand, referring to FIG. 10, it is an apparatus 80 for controlling routing information advertising provided by an embodiment of the present application, used for implementing the method for controlling routing information advertising as shown in FIG. 2, including: a receiver 1001, a memory 1002 and a processor 1003 connected with the receiver 1001 and the memory 1002 respectively, wherein,

-   -   the receiver 1001 is configured to receive second routing         information sent by a control device, wherein the second routing         information includes an advertising range of the second routing         information, and the advertising range of the second routing         information includes an identifier of an external neighbor of         the apparatus 80; and     -   is configured to control the advertising of the second routing         information according to the advertising range of the second         routing information.     -   the memory 1002 is configured to store a group of codes, wherein         the codes are used for controlling the processor 1003 to         implement the following actions:     -   advertising the second routing information to the external         neighbor of the apparatus corresponding to the advertising range         of the second routing information.

Further, referring to FIG. 11, the apparatus 80 may further include a sender 1004, configured to send a network topology for the apparatus 80 to the control device, for enabling the control device to generate the second routing information at least according to first routing information sent by a first forwarding device and the network topology for the apparatus.

Exemplarily, the apparatus 80 may be the second forwarding device in the above-mentioned method embodiment.

According to the apparatus for controlling routing information advertising provided by an embodiment of the present application, by receiving routing information containing an advertising range sent by a control device and by advertising the routing information according to the advertising range, so that advertising the routing information by a forwarding device is centrally controlled at the control device side, the configuration complexity is reduced and the operability is reinforced. The problems of complicated configuration and poor user operability caused by the fact that multiple routers are required to cooperatively configure the path weight in the prior art are solved.

In addition, an embodiment of the present application further provides a system for controlling routing information advertising, including any one of the above-mentioned apparatus 50 for controlling routing information advertising and/or any one of the above-mentioned apparatus 80 for controlling routing information advertising.

The foregoing descriptions are merely specific embodiments of the present application, rather than limiting the protection scope of the present application. Any skilled one who is familiar with this art could readily think of variations or substitutions within the disclosed technical scope of the present application, and these variations or substitutions shall fall within the protection scope of the present application. Accordingly, the protection scope of the claims should prevail over the protection scope of the present application. 

What is claimed is:
 1. A method for controlling routing information advertising, the method comprising: receiving, by a control device, first routing information sent by a first forwarding device, wherein the first routing information comprises an identifier of the first forwarding device; determining, by the control device, a first routing path according to the identifier of the first forwarding device, an identifier of a second forwarding device and a routing path group; and determining, by the control device, an advertising range of second routing information for the second forwarding device according to the first routing path, wherein a) the second routing information is routing information generated by the control device according to the first routing information; b) the second forwarding device is a receiver of the second routing information advertised by the control device; and c) the advertising range of the second routing information comprises an identifier of an external neighbor of the second forwarding device, for enabling the second forwarding device to advertise the second routing information according to the advertising range of the second routing information.
 2. The method according to claim 1, wherein determining the advertising range of the second routing information further comprises: determining the identifier of the external neighbor of the second forwarding device as the advertising range of the second routing information for the second forwarding device.
 3. The method according to claim 1, wherein determining the first routing path further comprises: selecting a routing path comprising the identifier of the first forwarding device and the identifier of the second forwarding device from the routing path group to serve as the first routing path.
 4. The method according to claim 1, wherein before determining the first routing path, the method further comprises: obtaining an internal network topology and an external network topology for the second forwarding device within a preset range; generating a whole network topology for the second forwarding device from the internal network topology and the external network topology for the second forwarding device; and determining the routing path group according to the whole network topology for the second forwarding device.
 5. The method according to claim 4, wherein obtaining the external network topology for the second forwarding device within the preset range comprises: obtaining the external network topology for the second forwarding device from a storage of the control device; or receiving the external network topology for the second forwarding device from the second forwarding device.
 6. The method according to claim 5, wherein obtaining the external network topology for the second forwarding device from the storage of the control device further comprises: receiving user input through a graphic user interface (GUI) or a command line.
 7. A method for controlling routing information advertising, the method comprising: sending, by a second forwarding device, a network topology for the second forwarding device to a control device, for enabling the control device to generate second routing information and an advertising range of the second routing information, wherein a) the second routing information is routing information generated according to first routing information from a first forwarding device, and b) the advertising range of the second routing information is an advertising range generated according to a first routing path, wherein the first routing path is a routing path generated according to the network topology for the second forwarding device, and comprises an identifier of the first forwarding device and an identifier of the second forwarding device; receiving, by the second forwarding device, the second routing information from the control device, wherein a) the second routing information comprises the advertising range of the second routing information, and b) the advertising range of the second routing information comprises an identifier of an external neighbor of the second forwarding device; and controlling, by the second forwarding device, the advertising of the second routing information according to the advertising range of the second routing information.
 8. The method according to claim 7, wherein controlling the advertising of the second routing information further comprises: advertising the second routing information to the external neighbor of the second forwarding device corresponding to the advertising range of the second routing information.
 9. A non-transitory computer-readable medium having processor-executable instructions stored thereon for controlling routing information advertising, the processor-executable instructions, when executed, facilitating performance of the following: receiving, by a control device, first routing information sent by a first forwarding device, wherein the first routing information comprises an identifier of the first forwarding device; determining, by the control device, a first routing path according to the identifier of the first forwarding device, an identifier of a second forwarding device and a routing path group; and determining, by the control device, an advertising range of second routing information for the second forwarding device according to the first routing path, wherein a) the second routing information is routing information generated by the control device according to the first routing information; b) the second forwarding device is a receiver of the second routing information advertised by the control device; and c) the advertising range of the second routing information comprises an identifier of an external neighbor of the second forwarding device, for enabling the second forwarding device to advertise the second routing information according to the advertising range of the second routing information.
 10. The non-transitory computer-readable medium according to claim 9, wherein determining the advertising range of the second routing information further comprises: using the identifier of the external neighbor of the second forwarding device as the advertising range of the second routing information for the second forwarding device.
 11. The non-transitory computer-readable medium according to claim 9, wherein determining the first routing path further comprises: selecting a routing path comprising the identifier of the first forwarding device and the identifier of the second forwarding device from the routing path group to serve as the first routing path.
 12. The non-transitory computer-readable medium according to claim 9, wherein the processor-executable instructions, when executed, further facilitate, before determining the first routing path: obtaining an internal network topology and an external network topology for the second forwarding device within a preset range; generating a whole network topology for the second forwarding device from the internal network topology and the external network topology for the second forwarding device; and determining the routing path group according to the whole network topology for the second forwarding device.
 13. The non-transitory computer-readable medium according to claim 12, wherein obtaining the external network topology for the second forwarding device within the preset range comprises: obtaining the external network topology for the second forwarding device from a storage of the control device; or receiving the external network topology for the second forwarding device from the second forwarding device.
 14. The non-transitory computer-readable medium according to claim 13, wherein obtaining the external network topology for the second forwarding device from the storage of the control device further comprises: receiving user input through a graphic user interface (GUI) or a command line.
 15. A non-transitory computer-readable medium having processor-executable instructions stored thereon for controlling routing information advertising, the processor-executable instructions, when executed, facilitating performance of the following: sending, by a second forwarding device, a network topology for the second forwarding device to a control device, for enabling the control device to generate second routing information and an advertising range of the second routing information, wherein a) the second routing information is routing information generated according to first routing information from a first forwarding device, and b) the advertising range of the second routing information is an advertising range generated according to a first routing path, wherein the first routing path is a routing path generated according to the network topology for the second forwarding device, and comprises an identifier of the first forwarding device and an identifier of the second forwarding device; receiving, by the second forwarding device, the second routing information from the control device, wherein a) the second routing information comprises the advertising range of the second routing information, and b) the advertising range of the second routing information comprises an identifier of an external neighbor of the second forwarding device; and controlling, by the second forwarding device, the advertising of the second routing information according to the advertising range of the second routing information.
 16. The non-transitory computer-readable medium according to claim 15, wherein controlling the advertising of the second routing information further comprises: advertising the second routing information to the external neighbor of the second forwarding device corresponding to the advertising range of the second routing information. 